Vacuum tube with two anodes and two grids



Feb. 24, 1931. s. PELLETIER VACUUM TUBE WITH TWO ANODES AND TWO GRIDS v Filed Mai-ch 1s 8 I I V 6 Fe Ms-Hr' am/mg Patented Feb. 24,1931

UNITED STATES PATENT OFFICE GABRIEL PELLETIER, or PARIS, FRANCE, ASSIGNOR 'ro socIErE E. o. & ALEXANDRE GBAMMONT, or rams, FRANGE, A COMPANY or 'rnnuon VACUUM TUBEWITH TWO ANODES AND TWO GRIDS Application filed March 15, 1928, Serial No. 261,981, and in France April 16, 1927.

' rati, chiefly those comprising a frequency charger using a two-grid valve to provide a certain independence between the two anode currents which interfers one with the other.

The object of my invention is an ionic valve allowing these objects to be reached and comprising a single filament, two grids and two anodes, each grid being more specially intended for acting on a given anode. A modification of the device allows each grid to act on both anodes, the action of each grid predominating on the anode which corresponds more specially to it. In another modification I may provide a difi'erent characteristic curve for each circuit even with the use of a single battery.

The following descri tion and appended drawings show by way 0 example four forms of execution of the invention.

Fig. 1 shows in perspective a tube accordin to the invention, each grid controlling o yone anode.

Fig. 2 shows, also in perspective, a device wherein each grid exerts a certain action on .both anodes. r

Fig. 3 shows a tube .wherein the cylindrical anodes are of different diameter with a view to obtain diii'er'ent characteristic curves for the two circuits.

Fig. 4 illustrates a two tube. g

In the device shown on Fig. 1 the filament 1 is placed at the center of the valve and the grids 2 and 3 formed by helical wires are disposed round it and in alinement one with the other; the same is the case of the cylindrical anodes 4. and 5 supposed partly torn off for clearness of the figure.

plate three-grid If the parts 2, 4 and 3, 5 are sufiiciently spaced the grid 2 will act only on anode 4 and will be substantially without action on anode 5; the grid 3 controls similarly only the current on anode 5 and will have no influence on that of anode 4.

It may be of interest on the contrary to ob- I tain a certain control of the current of anode 1 through thg grid 3 and reversely of the current of anode 5 through the grid 2, the current of each anode being however more influenced by the potential of its own grid than by that of the adjacent grid. The device shown on Fig. 2 allows this result to be obtained. The'grid 6 is of larger diameter than grid 7; it extends from the right-hand end of anode 4 and passes under anode 5; the grid 7 extending from the left hand end of anode 5 passes also under plate 4'; thus the current of anode 4 will be controlled by a great number of windings of the grid 6 and by only a few windings of grid 7; similarly the curtwo circuits even with a single battery for both anodes.

This arrangement shows moreover the advantage to allow due to the free space between the grids and the larger plate the insertion of a complementary control grid between the said plate and the corresponding grid. This arrangement may be of great interest in several applications of multiple electrode vacuum tubes for instance when neutralization is required. f

A three-grid two plate tube of this kind is shown on Fig. 4, the third or complementary grid 9 being disposed inside the anode 5 having the greater diameter, between it and the grid 6.

The current of one anode might also be controlled by both grids and the current of the other by only one thereof; the action of each gride on each anode will depend on the number of windings thereof passing under the anode considered so that it is possible to adjust the said action.

What I claim is:

1.' A vacuum tube comprising a filament, two anodes surrounding two difierent portions of the filament and a grid disposed between 'each anode and said filament, one of said grids overlapping the other and extending into the space between the anode corresponding to the other grid and the filament.

2. A vacuum tube comprising a filament,

two anodes surroundin two different portions of the filament and a grid disposed between each anode and said filament, each of said grids overlapping the other and extending partly into the space between the anode corresponding to the other grid and the filament.

' 3. A vacuum tube comprising a filament, twooanodes of difierent diameters surrounding two different portions of the filament and a grid disposed between each anode and said filament, each of said grids overlapping the other and extending partly into the space between the anode corresponding to the other grid and the filament, and a third control grid disposed between the larger anode and the other grids.

In testimony whereof I have aflixed my signature.

GABRIEL PELLETIER. 

